Comparison
235/45 R17 vs 255/35 R19
Going from 235/45 R17 to 255/35 R19 steps up to a 19-inch rim while trimming sidewall to stay near OEM rolling diameter. This swap moves rolling diameter a touch off the original spec. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides.
The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeCommon upgrade for sportier handling and a tighter wheel-gap look on the same vehicle.
Quick math: 255/35 R19 is 17.8 mm taller than 235/45 R17, shifting the speedometer by +2.77%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+17.8 mm
2.77%
Speedometer at 100
102.8 km/h
+2.77% error
Ground clearance
+8.9 mm
ride height delta
Sidewall change
-16.5 mm
revs/km: 481.5
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/compare/235-45-r17-vs-255-35-r19Detailed comparison
| Metric | 235/45 R17 | 255/35 R19 | Difference |
|---|---|---|---|
| Overall diameter | 643.3 mm | 661.1 mm | +17.8 mm (+2.77%) |
| Sidewall height | 105.8 mm | 89.3 mm | -16.5 mm |
| Circumference | 2.021 m | 2.077 m | +55.9 mm |
| Revs / km | 494.8 | 481.5 | -13.3 |
| Ground clearance | reference | +8.9 mm | +8.9 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 102.8 km/h | +2.77 km/h |
Verdict: excellent
Within ±3% — speedometer, ABS and traction control should behave normally.
Speedometer impact
At a true 100 km/h, your dashboard will read 102.8 km/h after switching to 255/35 R19 — a +2.77% offset. Use the speedometer error calculator to recheck for other indicated speeds, and the speedometer error guide for the full background.
Ground clearance change
The new tire's half-diameter changes ride height by +8.9 mm. Small differences are absorbed by suspension travel, but anything beyond ±10 mm can affect headlight aim, fender clearance and bump-stop margin. See the plus-sizing guide before committing.
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235/45 R17
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255/35 R19
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